package com.jiyun.testlist.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.jiyun.model.Train;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

/* *
 * @Author nxj
 * @Date 2023 08 2023/8/9 16 13
 * */
@Mapper
public interface TrainMapper extends BaseMapper<Train> {


    @Select("select count(id) from train")
    Integer find3();
}
